Enhanced thermoelectric performance of spark plasma sintered p-type Ca3−xYxCo4O9+δ systems

J. S. Cha; D. H. Kim; H. Y. Hong; K. Park

doi:10.1016/j.jmst.2020.02.034

Enhanced thermoelectric performance of spark plasma sintered p-type Ca₃₋_xY_xCo₄O₉₊_δ systems

J. S. Cha, D. H. Kim, H. Y. Hong, K. Park

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Highly textured dense Ca₃₋_xY_xCo₄O₉₊_δ (0 ≤ x ≤ 0.3) samples were fabricated by combining sol−gel process with spark plasma sintering (SPS). Y³⁺ substitution for Ca²⁺ simultaneously increased the Seebeck coefficient and reduced the thermal conductivity. The latter was attributed to the increase in lattice anharmonicity, structural distortion, and grain boundary area, which enhanced the phonon scattering. Ca_2.7Y_0.3Co₄O₉₊_δ showed the largest dimensionless figure-of-merit (ZT = 0.194) at 1073 K because it had the largest Seebeck coefficient and the lowest thermal conductivity. This ZT value was 55 % larger than that of undoped Ca₃Co₄O₉ (0.125 at 1073 K). Therefore, Y³⁺ substitution, sol−gel powder synthesis, and SPS are highly effective for enhancing the thermoelectric properties of Ca₃Co₄O₉.

Original language	English
Pages (from-to)	212-222
Number of pages	11
Journal	Journal of Materials Science and Technology
Volume	55
DOIs	https://doi.org/10.1016/j.jmst.2020.02.034
Publication status	Published - 2020 Oct 15
Externally published	Yes

Keywords

CaCoO
Electrical conductivity
Seebeck coefficient
Spark plasma sintering
Thermal conductivity
Thermoelectric properties

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jmst.2020.02.034

Cite this

@article{f6cefb3d3c0742a7972eb03a361f085e,

title = "Enhanced thermoelectric performance of spark plasma sintered p-type Ca3−xYxCo4O9+δ systems",

abstract = "Highly textured dense Ca3−xYxCo4O9+δ (0 ≤ x ≤ 0.3) samples were fabricated by combining sol−gel process with spark plasma sintering (SPS). Y3+ substitution for Ca2+ simultaneously increased the Seebeck coefficient and reduced the thermal conductivity. The latter was attributed to the increase in lattice anharmonicity, structural distortion, and grain boundary area, which enhanced the phonon scattering. Ca2.7Y0.3Co4O9+δ showed the largest dimensionless figure-of-merit (ZT = 0.194) at 1073 K because it had the largest Seebeck coefficient and the lowest thermal conductivity. This ZT value was 55 % larger than that of undoped Ca3Co4O9 (0.125 at 1073 K). Therefore, Y3+ substitution, sol−gel powder synthesis, and SPS are highly effective for enhancing the thermoelectric properties of Ca3Co4O9.",

keywords = "CaCoO, Electrical conductivity, Seebeck coefficient, Spark plasma sintering, Thermal conductivity, Thermoelectric properties",

author = "Cha, {J. S.} and Kim, {D. H.} and Hong, {H. Y.} and K. Park",

note = "Funding Information: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2017R1D1A1B03031196 ). Publisher Copyright: {\textcopyright} 2020",

year = "2020",

month = oct,

day = "15",

doi = "10.1016/j.jmst.2020.02.034",

language = "English",

volume = "55",

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journal = "Journal of Materials Science and Technology",

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publisher = "Chinese Society of Metals",

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AU - Cha, J. S.

AU - Kim, D. H.

AU - Hong, H. Y.

AU - Park, K.

N1 - Funding Information: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2017R1D1A1B03031196 ). Publisher Copyright: © 2020

PY - 2020/10/15

Y1 - 2020/10/15

N2 - Highly textured dense Ca3−xYxCo4O9+δ (0 ≤ x ≤ 0.3) samples were fabricated by combining sol−gel process with spark plasma sintering (SPS). Y3+ substitution for Ca2+ simultaneously increased the Seebeck coefficient and reduced the thermal conductivity. The latter was attributed to the increase in lattice anharmonicity, structural distortion, and grain boundary area, which enhanced the phonon scattering. Ca2.7Y0.3Co4O9+δ showed the largest dimensionless figure-of-merit (ZT = 0.194) at 1073 K because it had the largest Seebeck coefficient and the lowest thermal conductivity. This ZT value was 55 % larger than that of undoped Ca3Co4O9 (0.125 at 1073 K). Therefore, Y3+ substitution, sol−gel powder synthesis, and SPS are highly effective for enhancing the thermoelectric properties of Ca3Co4O9.

AB - Highly textured dense Ca3−xYxCo4O9+δ (0 ≤ x ≤ 0.3) samples were fabricated by combining sol−gel process with spark plasma sintering (SPS). Y3+ substitution for Ca2+ simultaneously increased the Seebeck coefficient and reduced the thermal conductivity. The latter was attributed to the increase in lattice anharmonicity, structural distortion, and grain boundary area, which enhanced the phonon scattering. Ca2.7Y0.3Co4O9+δ showed the largest dimensionless figure-of-merit (ZT = 0.194) at 1073 K because it had the largest Seebeck coefficient and the lowest thermal conductivity. This ZT value was 55 % larger than that of undoped Ca3Co4O9 (0.125 at 1073 K). Therefore, Y3+ substitution, sol−gel powder synthesis, and SPS are highly effective for enhancing the thermoelectric properties of Ca3Co4O9.

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KW - Seebeck coefficient

KW - Spark plasma sintering

KW - Thermal conductivity

KW - Thermoelectric properties

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